MIKULAK RAYMOND J. (1991). FIRST CLASS SERVICE: WORKBOOK 1. QUALITY RESOURCES.
Chicago-čujuhus (17. p.)MIKULAK RAYMOND J. FIRST CLASS SERVICE: WORKBOOK 1. NEW YORK: QUALITY RESOURCES, 1991.
MLA-čujuhus (9. p.)MIKULAK RAYMOND J. FIRST CLASS SERVICE: WORKBOOK 1. QUALITY RESOURCES, 1991.
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